libhw: Tidy

1 files changed, 47 insertions, 0 deletions

diff --git a/libhw/host_util.h b/libhw/host_util.h
new file mode 100644
index 0000000..edb6da4
--- /dev/null
+++ b/libhw/host_util.h
@@ -0,0 +1,47 @@
+/* libhw/host_util.h - Utilities for GNU/Linux hosts
+ *
+ * Copyright (C) 2024  Luke T. Shumaker <lukeshu@lukeshu.com>
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+#ifndef _LIBHW_HOST_SIGRT_H_
+#define _LIBHW_HOST_SIGRT_H_
+
+#include <time.h>                     /* for struct timespec */
+#include <sys/time.h>                 /* for struct timeval */
+
+#include <libhw/generic/alarmclock.h> /* for {X}S_PER_S */
+
+int host_sigrt_alloc(void);
+
+typedef struct timeval  host_us_time_t;
+typedef struct timespec host_ns_time_t;
+
+static inline host_us_time_t ns_to_host_us_time(uint64_t time_ns) {
+	host_us_time_t ret;
+	ret.tv_sec = time_ns
+		/NS_PER_S;
+	ret.tv_usec = (time_ns - ((uint64_t)ret.tv_sec)*NS_PER_S)
+		/(NS_PER_S/US_PER_S);
+	return ret;
+}
+
+static inline host_ns_time_t ns_to_host_ns_time(uint64_t time_ns) {
+	host_ns_time_t ret;
+	ret.tv_sec = time_ns
+		/NS_PER_S;
+	ret.tv_nsec = time_ns - ((uint64_t)ret.tv_sec)*NS_PER_S;
+	return ret;
+}
+
+static inline uint64_t ns_from_host_us_time(host_us_time_t host_time) {
+	return (((uint64_t)host_time.tv_sec) * NS_PER_S) +
+		((uint64_t)host_time.tv_usec * (NS_PER_S/US_PER_S));
+}
+
+static inline uint64_t ns_from_host_ns_time(host_ns_time_t host_time) {
+	return (((uint64_t)host_time.tv_sec) * NS_PER_S) +
+		((uint64_t)host_time.tv_nsec);
+}
+
+#endif /* _LIBHW_HOST_SIGRT_H_ */